The rubber boot often comes off because it gets oil contaminated, which softens it up to the point where it does not grab onto the tube properly. So likely you need to replace the spark plug seals as well as the valve cover gasket. It's almost always cylinder #1 that has the problem.
As for wires, I've found the originals to be the best, if you can just grab a new boot from the wreckers. To pull the old one out, you'll need a hook type device, I made one out of a piece of aluminum, I ground a hook onto the end, but any type of hooked tool is okay.
If you need a "new" set, again I would try and get that from a salvage yard. If you want to go new, then get as close to OEM as possible.
Something like this I think is as close as you can get to OEM without actually going to a dealer.